JPS58162926A - Optical scanner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] 11> Technical Fees of the Invention The present invention relates to an optical scanning device such as a laser printer, and particularly to an optical scanning device that uses two beams to divide the image plane into left and right parts to achieve wide-area optical scanning. There is C related to equipment.

(21 Between conventional technology and single point optical scanning device, the light emitted from the laser diode is deflected in the rotating direction by a rotating multi-Wj cage, passed through an imaging optical system, and then reflected by a plane mirror for scanning. Generally, scanning is carried out by placing a light source within the area.In Japanese Patent Application No. 56-205561, the inventors previously proposed a two-layer scanning device equipped with a light source in 18 circles of a rotating multi-faceted frame. A scanning lens system is arranged, and an anti-114t- is provided behind each scanning lens system, so that the traveling directions on the image plane of the irradiated light projected onto the image plane from these reflections are substantially mutual. When the above-mentioned reflection lines are arranged so that they are parallel, and the scanning 1III of each scanning lens system is taken as t, the scanning width t of the entire scanning optical system is #lttetgo1, +1
2 is disclosed.

Figure 4N1 is a schematic perspective view showing an embodiment of this optical scanning device, in which one rotary multi-rotator rkJ 1, a visiting mirror 10 mirrors 1
A light source section consisting of two conductor laser beams #2.2'' arranged toward t1m and 11sK, a collimating lens 5.S' that converts the output light of the semiconductor laser into parallel light, and a straight light source 2.
．． 2' and two r@-lenses (scanning lenses) each pairing with each r@-lens 4.4', and nine reflective lenses located behind each of the lenses 4.4'. It is composed of two plane jets 5 and 5'. The aforementioned Terako 1t
115, 5' are projected onto the →photocondot 6 O@@6*, and are arranged so that the midtone direction of the irradiated light on the image plane 6a is substantially parallel. In this device, the total scan @t is 2 Os minutes 11,1. 2 r-lenses 4.4 for each section and 12 scans.
The optical system is configured to divide the process using . B is the direction of rotation of the photocon drum (illll scanning direction), and B is the main scanning direction of the beam. The above optical scanning W! using two beams! In the case of heavy beams, the entire device can be smaller and have a wider scanning width than in the case of nine beams. However, in the old inspection device f using the governor and two beams shown in No. 11v1, the rotating polygon, the beam 1 and the reflecting plane mirror 5,
Other defects due to the concave surface of 5' and the rotation of the flat surface (mainly (b) production machine for each surface)
+F, inclination accuracy for k11 rotational axis)) etc., (
B) The scanning beam that is projected onto the face on the Aoto drum via the multifaceted multifaceted light and the reflective plane face is the joint part of the left and right two beams, that is, the part where the scanning + @Ll or the contact part (Fig. 1, 6b"). The part where these beams overlap corresponds to the center of the scanning image plane of the photocon drum, and is the most visible part of the printing on a laser printer. It has the disadvantage that it is doubled and the height difference is undesirable, which deteriorates its quality.

(3) Object of the Invention It is an object of the present invention to overcome the above-mentioned drawbacks and to provide an optical scanning device for learning the print center position of a two-beam scanning device.

(4) Structure of the Invention The object of the present invention is to provide two semiconductor laser light sources, a means for forming a diverging beam emitted from the laser light source into a parallel light beam, and a rotary rotary unit for deflecting the two parallel light beams. rIJfIA, two sets of scanning lenses that focus the nine beams deflected by the rotating polygonal bowl onto the inter-image space;
The optical path of the 9th & 4D beam passes through the scanning lens.
In the Kugenro IF wheel 11, each optical element is arranged in a rod arrangement so that the two sets of O scanning beams scan evenly left and right on the scanning surface moving in the main scanning direction. This is achieved by an optical scanning device having nine features in which a slit is arranged near the scanning surface so that the two sets of scanning beams do not overlap in the scanning of the sets of scanning beams.

(5) Example of a single axis of invention Embodiments of the present invention will be described in detail below based on the drawings.

Figure 11112 is a schematic perspective view of one embodiment of the present invention. The same parts KN as the parts shown in FIG. 1 above are given the same reference numerals. As shown in FIG. 82, the Genro I-device according to the present invention has the same configuration as the pre-travel light device shown in FIG. 1, except that the slit 7 is disposed close to the photoconductor drum 6. In other words, two semiconductor laser lights 1112
．． 2', and collimating lenses 5 and 5' that convert the 9-output light emitted from the nuclear light fi2°2' into parallel light that forms the starting point of the optical path.
A multi-rotation (2) mirror 1 that deflects the two beams to the left and right, which are modulated into parallel light by the primate lens S, 5'.
2 to form an image on the image plane 6a on the photocon drum 6 of each beam polarized by the 1q1 transfer 1n 1'
In addition to the conventional optical scanning device consisting of a set of scanning lenses (f, I lenses) and two sets of reflections 1115.5' that pass through the scanning lenses and change the yCl of the 92 beams, this A feature of the invention is that a slit or light shielding means 7 is provided near the image plane or scanning plane on the photocondrum 6. The slit 7 is preferably provided by shifting the scanning position of the left laser scanning section 81 and the right laser scanning section 8b by the following amount, as can be seen from the enlarged view of the center part of the laser scanning section. In other words, the deviation measurement is the difference (m-+a) in the static state quantity of one mirror surface of the rotating polygon mirror 1 which is responsible for each left and right scan (b) The scan pitch is calculated by adding the number of surfaces O integer times to m>m is the Qinjie value. For example, if the number of rotation reference mha buttons is 12 screens, 9, and the scanning pitch is 100, L will be 19 m, or it 2.1 m, or &5 proverbs, etc. The slit of the present invention is preferably arranged, for example, at a distance of 1 to S from the scanning surface.

With such a slit, it is possible to avoid overlapping two beams in the upper and lower, left and right directions at the joint portion of the left and right laser beam scanning. When O is provided with L as described above, the left and right scanning areas are rotated repeatedly [scanning is performed in the same -vL area of t#R], and the inclination due to manufacturing error with respect to the rotating mirror rotation wheel is the same. This eliminates the vertical deviation. However, in addition to the fact that the scanning line O is elongated in the left and right direction due to horizontal accuracy error, it is cut with a slit edge, so l1lr
! ! This makes it possible to join the left and right scanning areas.

(6) More than the effects of the invention, as can be explained in detail, in the 2411 (2-beam left and right split light red Tt acquisition including the Dp quantity lens), the entire scanning is divided and the area near the scanning plane is explained in detail. By arranging a slit in the ζ section, it is possible to eliminate the deterioration in quality at the center of the print.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing an embodiment of a conventional optical scanning device, and FIG. 2 is a schematic perspective view showing an embodiment of the optical capsule scanning device according to the present invention. -Rotation Wj@, 1m, 1b...Rotation-(2)
, 2, 2'... No conductor, 5.3'... Collimating lens, 4° 4'... Scanning lens or F-lens, 5,5''... Reflecting plane mirror, 6...Photocon drum, 7...Slit, 8a...Left laser scanning section, 8b...Right laser scanning O Patent agent Fujitsu Ltd. Patent application agent Patent attorney Akira Aoki Nishi & Kazuyuki Patent Attorney Yukio Uchida Patent Attorney Akiyuki Yamaguchi Figures 1 and 2

Claims (1)

[Claims] t. A conductor, a means for forming the nine beams emitted from the laser light source into two parallel light beams with an optical path JA, and one piece for deflecting the two parallel light beams. O rotation reference
IIJIIm, two sets of rock surveying lenses that focus each O-beam on an image plane, which can be deflected by the rotating multi-directional lens;
It has two sets of reflecting mirrors that change the optical path of the O beam that has passed through the scanning lens every winter, and the two sets of scanning beams move each element in the left and right directions on the scanning surface moving in the sub-scanning direction. In an optical scanning device arranged so as to scan in increments of 1 to 5 minutes; at the scanning plane joining portion of the two sets of O-curved scanning beams, the two sets of scanning beams are uniformly arranged with slits near the scanning planes; An optical scanning device characterized by: